For man believes with his heart and so is justified, and he confesses with his lips and so is saved. The scripture says, “No one who believes in him will be put to shame.” For there is no distinction between Jew and Greek; the same Lord is Lord of all and bestows his riches upon all who call upon him. For, “every one who calls upon the name of the Lord will be saved.” But how are men to call upon him in whom they have not believed? And how are they to believe in him of whom they have never heard? And how are they to hear without a preacher? And how can men preach unless they are sent? As it is written, “How beautiful are the feet of those who preach good news!” But they have not all obeyed the gospel; for Isaiah says, “Lord, who has believed what he has heard from us?” So faith comes from what is heard, and what is heard comes by the preaching of Christ.
–Romans 10:10-17